Why thionyl chloride behaves as Lewis acid as well as Lewis base?.

Hybridization of sulphur in SOCI₂ is sp3 having three bond pair and one lone pair.

Lewis base character is due to the presence of a lone pair of electrons. In SOCl₂, the central atom sulphur atom has vacant d orbitals. Hence it can accept electron pairs. Therefore it can behave as a Lewis acid.

Related Questions:

(1) What is oil of vitriol ?

(2)Why SF6 is inert where as SF4 is highly reactive towards H20 ?.

(3) Why SF6 is known but SCl6 is not ? Explain.

(4) What are structures of SO3 in gas phase as well as solid phase ( at room temperature)?

(5) Why SF6 behave inert towards hydrolysis?

(6) What are the structure of cyclic trimer of SO3 ,

(7) Methylcyclotrisilicone, Cyclotrimetaphosphate and cyclotrisilicate ion ?

(8) What are the SESQUI OXIDES ? give the examples.

(9) Arrange in increasing order of extent of hydrolysis [ CCI4, MgCI2, AICI3, PCl5, SiCI4].

(10) Although Sulphur contain vacant d-orbital but SF6 does not under go hydrolysis. Why ?

(11) CCl4 can not be hydrolysed but SiCl4 can be. Why?

(12) Silianol (SiH3OH) is more acidic than methanol (CH3OH) why?

(13) What happened when Graphite treated concentrated acids like HNO3/HF or KMnO4 ?.

(14) Why Boric acid become strong acid in the presence of cis 1,2-diol or 1,3-diol ?

(15) What is the molecular formula of Borax ?

(16) What is oil of vitriol ?

Why SF6 is known but SCl6 is not ? Explain.

Sulphur is a small atom. Hence it can accommodate six small fluorine atoms around it. While size of Chlorine is larger than fluorine, thus S cannot accommodate six large chlorine atoms around it. Moreover, because of low electronegativity of Cl, it cannot easily oxidized sulphur to form S(VI). Hence SCl₆ cannot easily form and stable.

Related Questions:

Question (1): Why aqueous solution of AlCl₃ is acidic in nature?

Question (2): What happen when aq AlCl₃ react with Acid or Base?

Question (3): Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?

Question (4): Arrange in increasing order of extent of hydrolysis [ CCI₄, MgCI₂, AICI₃, PCl₅, SiCI₄].

Question (5): Although Sulphur contain vacant d-orbital but SF6 does not undergo hydrolysis. Why?

Question (6): CCl₄ can not be hydrolysed but SiCl4 can be. Why?

Question (7): What are the hydrolysis products of urea?

Question (8): Why SF₆ is inert where as SF₄ is highly reactive towards H₂0?.

Question (9): Why SF₆ behaves inert towards hydrolysis?

Question (10): Why PCl₃ hydrolysed while NCl₃ can not be hydrolysed?

Question (11): Why hydrolysis of NCl3 gives NH4OH and HOCl, while PCl3 on hydrolysis gives H3PO3 and HCl?

Question (12) NCl3 and PCl3 on hydrolysis give different kinds of products. These is because of

Why SF6 is inert where as SF4 is highly reactive towards H20 ?.

The maximum coordination number of sulphur is 6. Hence S cannot accommodate more than 12 electrons around it. SF₆ is covalently saturated compound. Thus six fluorine atoms around sulphur protect sulphur from attack by reagent to such an extent that even thermodynamically favorable reaction like hydrolysis (S-O bond is stronger than S-F bond) does not occur. On the other hand, in SF₄, the coordination number is only four. Hence sulphur can be attacked by H₂O.

Related Questions:

Question (1): Why aqueous solution of AlCl₃ is acidic in nature?

Question (2): What happen when aq AlCl₃ react with Acid or Base?

Question (3): Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?

Question (4): Arrange in increasing order of extent of hydrolysis [ CCI₄, MgCI₂, AICI₃, PCl₅, SiCI₄].

Question (5): Although Sulphur contain vacant d-orbital but SF6 does not undergo hydrolysis. Why?

Question (6): CCl₄ can not be hydrolysed but SiCl4 can be. Why?

Question (7): What are the hydrolysis products of urea?

Question (8): Why SF₆ is inert where as SF₄ is highly reactive towards H₂0?.

Question (9): Why SF₆ behaves inert towards hydrolysis?

Question (10): Why PCl₃ hydrolysed while NCl₃ can not be hydrolysed?

Question (11): Why hydrolysis of NCl3 gives NH4OH and HOCl, while PCl3 on hydrolysis gives H3PO3 and HCl?

Question (12) NCl3 and PCl3 on hydrolysis give different kinds of products. These is because of